Control valve for variable displacement compressor

Abstract

There is provided a control valve for a variable displacement compressor capable of directly connecting a plunger to a valve rod in a relatively easy way, and realizing an improvement in assemblability, reduction in costs, and the like. A connecting cylinder for directly connecting the plunger to the valve rod is provided. The valve rod is provided with a mushroom-like or flange-like part. The connecting cylinder is provided with an elastic locking piece which, by pushing the mushroom-like or flange-like part into the elastic locking piece, is pushed and opened outward in a radial direction so as for the mushroom-like or flange-like part to pass through the elastic locking piece, and which, after the passing of the mushroom-like or flange-like part, is restored to an original shape due to elasticity which the elastic locking piece has, and locks the mushroom-like or flange-like part.

1 . A control valve for a variable displacement compressor comprising:
 a valve rod having a valve body part;   a valve body having a guide hole, in which the valve rod is slidably fitted, and having a valve chamber provided with a valve port, at which the valve body part contacts/leaves, wherein a discharge-pressure refrigerant inlet for guiding therein refrigerants of discharge pressure from a compressor is provided upstream of the valve port, and a refrigerant outlet communicated with a crank chamber of the compressor is provided downstream of the valve port;   an electromagnetic actuator including a plunger for moving the valve rod in a valve-closing direction;   a pressure sensing chamber into which intake pressure is guided from the compressor; and   a pressure-sensitive responding member which presses the valve rod in a valve-opening direction in response to the pressure of the pressure sensing chamber,   wherein a connecting member for connecting the plunger to the valve rod is provided, the connecting member being configured such that the valve rod is inserted into the guide hole of the valve body, thereby engaging with one end of the valve rod to lock the one end.   
     
     
         2 . The control valve for a variable displacement compressor of  claim 1 , wherein the valve rod is provided with a mushroom-like or flange-like part;
 wherein the connecting member has a cylindrical shape, and is fabricated from an elastic plate material; and   wherein the connecting member is provided with an elastic locking piece which, by pushing the mushroom-like or flange-like part into the elastic locking piece, is pushed and opened outward in a radial direction so as for the mushroom-like or flange-like part to pass through the elastic locking piece, and which, after the passing of the mushroom-like or flange-like part, is restored to an original shape due to elasticity which the elastic locking piece has, and locks the mushroom-like or flange-like part.   
     
     
         3 . The control valve for a variable displacement compressor of  claim 2 , wherein a bottom part of the cylindrical connecting member is provided with the elastic locking piece having a truncated cone shape split into a plurality of parts, and the elastic locking piece bends inward from the bottom part. 
     
     
         4 . The control valve for a variable displacement compressor of  claim 1 , wherein there is provided, in the connecting member, a bellows device and the pressure sensing chamber both serving as the pressure-sensitive responding member.